EP0292739B1 - Method and arrangement for breaking up grindable material - Google Patents

Method and arrangement for breaking up grindable material Download PDF

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Publication number
EP0292739B1
EP0292739B1 EP88107072A EP88107072A EP0292739B1 EP 0292739 B1 EP0292739 B1 EP 0292739B1 EP 88107072 A EP88107072 A EP 88107072A EP 88107072 A EP88107072 A EP 88107072A EP 0292739 B1 EP0292739 B1 EP 0292739B1
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EP
European Patent Office
Prior art keywords
grinding
sifter
track
sifting
tailings
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EP88107072A
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German (de)
French (fr)
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EP0292739A3 (en
EP0292739A2 (en
Inventor
Ludger Ing. Lohnherr (Grad.)
Walter Dipl.-Ing. Holz
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone

Definitions

  • the invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 5) for crushing brittle regrind.
  • the invention is therefore based on the object of designing a method (in accordance with the preamble of claim 1) and a system (in accordance with the preamble of claim 5) in such a way that the throughput of the system is considerably increased with comparatively low system complexity.
  • the plant illustrated in FIG. 1 for comminuting brittle ground material for example cement clinker, contains a roller mill 1, a classifier 2 arranged above it, a material bed roller mill 3, a bucket elevator 4, a fine material separator 5 and a number of other ones in connection with the Function of described system parts.
  • the roller mill 1 shown in its details from FIG. 2 has a horizontal grinding path 7 which rotates around the vertical axis 6 and on which grinding rollers 8, 9 are supported with pressure.
  • the grinding track 7 is driven by a drive motor 10 and a gear (not illustrated in detail) in the base of the roller mill 1.
  • An adjustable nozzle ring 11 is arranged on the circumference of the grinding track 7, through which an air flow (arrows 12) is fed to the grinding track 7.
  • the dynami arranged above the roller mill 1 cal classifier 2 contains a fixed (suitably adjustable) guide vane ring 15 and a sight basket 18 driven by a motor 17 via a shaft 16.
  • the shaft is supported at its lower end via radial struts 19.
  • the shaft 16 also carries above the viewing basket 18 a spreading plate 20, to which the material to be sifted is fed via nozzles 21, 22 from the bucket elevator 4 (arrow 23).
  • the classifier 2 has a funnel 24 below the guide vane ring 15, through which the grains can be guided back onto the grinding path 7 of the roller mill 1.
  • the raw material is fed onto the grinding track 7 via an opening 25 (arrow 26).
  • a semolina screw 27 At the lower end of the funnel 24 there is also connected a semolina screw 27, the speed of which can be regulated and which feeds an adjustable part of the semolina directly to the roller mill 3 (arrow 28 in FIG. 1).
  • the air stream carrying the fine material is discharged from the classifier 2 via a nozzle 29 (arrow 30).
  • the regrind to be crushed is the roller mill 1 fed from a silo 31 via a weigh feeder 32 and an air seal 33.
  • the ground material that has been comminuted sufficiently on the grinding path 7 is conveyed to the classifier 2 by the air flow.
  • the fine material leaving the classifier together with the air flow is separated in the separator 5.
  • the grains accumulating in the sifter 2 are partly returned to the grinding path 7 of the roller mill 1.
  • a further, adjustable portion of the semolina reaches the roller mill 3 directly via the semolina screw 27.
  • This material bed roller mill is also supplied with the regrind that falls down over the edge of the grinding track 7.
  • the rollers of which are pressed against one another at high pressure, the material undergoes comminution of the material bed with clear formation of agglomerates.
  • the regrind discharged from the roller mill 3 is conveyed upwards via the bucket elevator 4 and fed via a flap 34 either to the spreading plate 20 of the classifier 2 or to another purpose (vehicle 35) (if desired, this stream of material passed via the bucket elevator 4 can also be divided).
  • the agglomerates of the ground material formed in the roller mill 3 undergo deagglomeration.
  • the finished goods that already exist after the roller mill 3 has passed through are viewed in this way and are no longer fed to the roller mill 1 again.
  • the roller mill 1 is significantly relieved. This results in a significant reduction in pressure loss for the roller mill, which leads to significant energy savings in the pneumatic conveying of the ground material.
  • the bucket conveyor material is already largely dried, since in the roller mill 3 the ground material falling down over the edge of the grinding path 7 is ground together with the largely dried semolina (supplied via the semolina screw 27).
  • the pneumatic transport of the ground material in a conventional grinding plant using a roller mill takes up a relatively large proportion of the total that is used for grinding Use energy.
  • the regrind falling down through the nozzle ring 11 is subjected to further comminution by means of the material bed roller mill 3 and fed to the classifier 2 via the bucket elevator 4.
  • This regrind, which is fed directly to the classifier contains (depending on the type of material to be ground) up to 50% finished product. This portion of the material is thus removed from the pneumatic transport. This results in an up to 40% lower pressure loss of the grinding system, which results in a correspondingly high energy saving on the mill fan.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)

Description

Die Erfindung betrifft ein Verfahren (entsprechend dem Oberbegriff des Anspruches 1) sowie eine Anla­ge (gemäß dem Gattungsbegriff des Anspruches 5) zur Zerkleinerung von sprödem Mahlgut.The invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 5) for crushing brittle regrind.

Es besteht vielfach der Wunsch, bestehende Anlagen der vorstehend genannten Art (enthaltend Rollenmüh­le, Sichter und Becherwerk (DE-A-2 912 635) in ihrer Durchsatzlei­stung erheblich zu steigern.There is often a desire to significantly increase the throughput of existing plants of the type mentioned above (containing roller mill, classifier and bucket elevator (DE-A-2 912 635).

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren (entsprechend dem Oberbegriff des Anspru­ches 1) sowie eine Anlage (gemäß dem Gattungsbegriff des Anspruches 5) so auszubilden, daß mit vergleichs­weise geringem anlagentechnischen Aufwand die Durch­satzleistung der Anlage erheblich vergrößert wird.The invention is therefore based on the object of designing a method (in accordance with the preamble of claim 1) and a system (in accordance with the preamble of claim 5) in such a way that the throughput of the system is considerably increased with comparatively low system complexity.

Diese Aufgabe wird erfindungsgemäß durch die kenn­zeichnenden Merkmale der Ansprüche 1 und 5 gelöst. Zweckmäßige Ausgestaltungen der Erfindung sind Ge­genstand der Unteransprüche.This object is achieved by the characterizing features of claims 1 and 5. Appropriate embodiments of the invention are the subject of the dependent claims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung veranschaulicht. Es zeigen

  • Fig. 1 ein Gesamtschema einer erfindungsgemäßen Anlage,
  • Fig. 2 einen Schnitt durch Rollenmühle und Sich­ter der Anlage gemäß Fig. 1.
An embodiment of the invention is illustrated in the drawing. Show it
  • 1 is an overall diagram of a system according to the invention,
  • FIG. 2 shows a section through roller mill and classifier of the plant according to FIG. 1.

Die in Fig. 1 veranschaulichte Anlage zur Zerklei­nerung von sprödem Mahlgut, beispielsweise von Zementklinker, enthält eine Rollenmühle 1, einen darüber angeordneten Sichter 2, eine Gutbettwal­zenmühle 3, ein Becherwerk 4, einen Feingut-Ab­scheider 5 sowie eine Anzahl weiterer, in Zusam­menhang mit der Funktion beschriebener Anlagentei­le.The plant illustrated in FIG. 1 for comminuting brittle ground material, for example cement clinker, contains a roller mill 1, a classifier 2 arranged above it, a material bed roller mill 3, a bucket elevator 4, a fine material separator 5 and a number of other ones in connection with the Function of described system parts.

Die in ihren Einzelheiten aus Fig. 2 ersichtliche Rollenmühle 1 besitzt eine um die vertikale Achse 6 umlaufende horizontale Mahlbahn 7, auf der sich Mahlrollen 8, 9 mit Druck abstützen.The roller mill 1 shown in its details from FIG. 2 has a horizontal grinding path 7 which rotates around the vertical axis 6 and on which grinding rollers 8, 9 are supported with pressure.

Der Antrieb der Mahlbahn 7 erfolgt durch einen An­triebsmotor 10 und ein nicht im einzelnen veran­schaulichtes Getriebe im Sockel der Rollenmühle 1.The grinding track 7 is driven by a drive motor 10 and a gear (not illustrated in detail) in the base of the roller mill 1.

Am Umfang der Mahlbahn 7 ist ein verstellbarer Dü­senring 11 angeordnet, durch den ein Luftstrom (Pfeile 12) der Mahlbahn 7 zugeführt wird.An adjustable nozzle ring 11 is arranged on the circumference of the grinding track 7, through which an air flow (arrows 12) is fed to the grinding track 7.

Das über den Rand der Mahlbahn 7 nach unten (d.h. entgegen dem Luftstrom) ausfallende, noch nicht genügend zerkleinerte Mahlgut gelangt über eine Schurre 13 zur Walzenmühle 3 (Pfeil 14).The ground material that falls down over the edge of the grinding track 7 (i.e. against the air flow) and has not yet been comminuted sufficiently reaches a roller mill 3 via a chute 13 (arrow 14).

Der oberhalb der Rollenmühle 1 angeordnete dynami­ sche Sichter 2 enthält einen feststehenden (zweck­mäßig einstellbaren) Leitschaufelkranz 15 sowie einen über eine Welle 16 von einem Motor 17 an­getriebenen Sichtkorb 18. Die Welle ist an ihrem unteren Ende über radiale Streben 19 gelagert.The dynami arranged above the roller mill 1 cal classifier 2 contains a fixed (suitably adjustable) guide vane ring 15 and a sight basket 18 driven by a motor 17 via a shaft 16. The shaft is supported at its lower end via radial struts 19.

Die Welle 16 trägt ferner oberhalb des Sichtkorbes 18 einen Streuteller 20, dem das zu sichtende Gut über Stutzen 21, 22 vom Becherwerk 4 zugeführt wird (Pfeil 23).The shaft 16 also carries above the viewing basket 18 a spreading plate 20, to which the material to be sifted is fed via nozzles 21, 22 from the bucket elevator 4 (arrow 23).

Der Sichter 2 weist unterhalb des Leitschaufelkran­zes 15 einen Trichter 24 auf, durch den die Grieße zurück auf die Mahlbahn 7 der Rollenmühle 1 ge­führt werden können. Die Aufgabe des Rohmateria­les auf die Mahlbahn 7 erfolgt über eine Öffnung 25 (Pfeil 26).The classifier 2 has a funnel 24 below the guide vane ring 15, through which the grains can be guided back onto the grinding path 7 of the roller mill 1. The raw material is fed onto the grinding track 7 via an opening 25 (arrow 26).

An das untere Ende des Trichters 24 ist weiterhin eine Grießschnecke 27 angeschlossen, die in ihrer Drehzahl regelbar ist und die einen einstellbaren Teil der Grieße direkt der Walzenmühle 3 zuführt (Pfeil 28 in Fig. 1).At the lower end of the funnel 24 there is also connected a semolina screw 27, the speed of which can be regulated and which feeds an adjustable part of the semolina directly to the roller mill 3 (arrow 28 in FIG. 1).

Der das Feingut führende Luftstrom wird aus dem Sichter 2 über einen Stutzen 29 abgeführt (Pfeil 30).The air stream carrying the fine material is discharged from the classifier 2 via a nozzle 29 (arrow 30).

Die Funktion der Anlage nach dem erfindungsgemäßen Verfahren ist damit wie folgt:The function of the system using the method according to the invention is thus as follows:

Das zu zerkleinernde Mahlgut wird der Rollenmühle 1 von einem Silo 31 über eine Dosierbandwaage 32 und ein Luftabschlußorgan 33 zugeführt. Das auf der Mahl­bahn 7 genügend zerkleinerte Mahlgut wird durch den Luftstrom zum Sichter 2 gefördert. Das den Sichter zusammen mit dem Luftstrom verlassende Feingut wird im Abscheider 5 abgeschieden.The regrind to be crushed is the roller mill 1 fed from a silo 31 via a weigh feeder 32 and an air seal 33. The ground material that has been comminuted sufficiently on the grinding path 7 is conveyed to the classifier 2 by the air flow. The fine material leaving the classifier together with the air flow is separated in the separator 5.

Die im Sichter 2 anfallenden Grieße werden teil­weise zurück zur Mahlbahn 7 der Rollenmühle 1 ge­führt. Ein weiterer, einstellbarer Anteil der Grieße gelangt über die Grießschnecke 27 direkt zur Walzenmühle 3. Dieser Gutbettwalzenmühle wird außerdem das über den Rand der Mahlbahn 7 nach unten ausfallende Mahlgut zugeführt. In der Walzenmühle 3, deren Walzen mit hohem Druck gegeneinandergepreßt wird, erfährt das Gut eine Gutbettzerkleinerung unter deutlicher Bildung von Agglomeraten.The grains accumulating in the sifter 2 are partly returned to the grinding path 7 of the roller mill 1. A further, adjustable portion of the semolina reaches the roller mill 3 directly via the semolina screw 27. This material bed roller mill is also supplied with the regrind that falls down over the edge of the grinding track 7. In the roller mill 3, the rollers of which are pressed against one another at high pressure, the material undergoes comminution of the material bed with clear formation of agglomerates.

Das aus der Walzenmühle 3 ausgetragene Mahlgut wird über das Becherwerk 4 hochgefördert und über eine Klappe 34 entweder dem Streuteller 20 des Sichters 2 oder einem anderen Verwendungszweck (Fahrzeug 35) zugeführt (gewünschtenfalls kann dieser über das Becherwerk 4 geführte Gutstrom auch geteilt werden).The regrind discharged from the roller mill 3 is conveyed upwards via the bucket elevator 4 and fed via a flap 34 either to the spreading plate 20 of the classifier 2 or to another purpose (vehicle 35) (if desired, this stream of material passed via the bucket elevator 4 can also be divided).

Auf dem rotierenden Streuteller 20 des Sichters 2 erfahren die in der Walzenmühle 3 gebildeten Agglo­merate des Mahlgutes eine Desagglomeration. Die auf diese Weise aufgeschlossenen Schülpen werden auf diese Weise gleichmäßig der Sichtluft zuge­führt.On the rotating spreading plate 20 of the classifier 2, the agglomerates of the ground material formed in the roller mill 3 undergo deagglomeration. The Schülpen open in this way in this way evenly fed to the classifying air.

Das nach dem Durchsetzen der Walzenmühle 3 bereits vorhandene Fertiggut wird auf diese Weise direkt gesichtet und nicht mehr erneut der Rollenmühle 1 zugeführt. Die Rollenmühle 1 wird dadurch wesent­lich entlastet. Für die Rollenmühle ergibt sich hierdurch eine erhebliche Reduzierung des Druck­verlustes, was zu einer deutlichen Energieeinspa­rung bei der pneumatischen Förderung des Mahlgu­tes führt.The finished goods that already exist after the roller mill 3 has passed through are viewed in this way and are no longer fed to the roller mill 1 again. The roller mill 1 is significantly relieved. This results in a significant reduction in pressure loss for the roller mill, which leads to significant energy savings in the pneumatic conveying of the ground material.

Von besonderem Vorteil ist dabei auch, daß das Be­cherwerk-Umlaufgut bereits weitgehend getrocknet ist, da in der Walzenmühle 3 das über den Rand der Mahlbahn 7 nach unten ausfallende Mahlgut zusammen mit bereits weitgehend getrockneten Grießen (zugeführt über die Grießschnecke 27) vermahlen wird.It is also particularly advantageous that the bucket conveyor material is already largely dried, since in the roller mill 3 the ground material falling down over the edge of the grinding path 7 is ground together with the largely dried semolina (supplied via the semolina screw 27).

Die Regelung der Anlage erfolgt im wesentlichen unter Benutzung folgender Regelkreise:

  • Ein erster Regelkreis (Regler 36) regelt die über die Dosierbandwaage 32 der Rollenmühle 1 zuge­führte Aufgabemenge in Abhängigkeit von der An­triebsleistung der Rollenmühle 1.
  • Ein zweiter Regelkreis (Regler 37) hält die elektrische Stromaufnahme der Gutbettwalzen­mühle dadurch konstant, daß der Querschnitt des verstellbaren Düsenringes 11 und damit die Gas­geschwindigkeit im Düsenring entsprechend gere­gelt wird (mit der Gasgeschwindigkeit im Düsen­ring ändert sich der entgegen dem Luftstrom nach unten ausfallende Teil des Mahlgutes und damit die Becherwerks-Umlaufgutmenge).
  • Ein dritter Regelkreis (Regler 38) hält die durch die Anlage gezogene Gasmenge durch Be­einflussung der Drehzahl eines dem Feingut-Ab scheider 5 nachgeschalteten Ventilators 39 kon­stant.
  • Ein vierter Regelkreis (Regler 40) steuert eine Umluftklappe 41 und hält dadurch den im Luft­strom vor der Rollenmühle 1 herrschenden Unter­druck konstant.
The system is essentially controlled using the following control loops:
  • A first control loop (controller 36) controls the feed quantity fed to the roller mill 1 via the metering belt scale 32 as a function of the drive power of the roller mill 1.
  • A second control loop (controller 37) keeps the electrical current consumption of the material bed roller mill constant in that the cross section of the adjustable nozzle ring 11 and thus the gas speed in the nozzle ring is regulated accordingly (with the gas speed in the nozzle ring, the part of the regrind falling down against the air flow changes and thus the bucket elevator circulating material quantity).
  • A third control loop (controller 38) keeps the amount of gas drawn through the system constant by influencing the speed of a fine particle separator 5 downstream fan 39.
  • A fourth control loop (controller 40) controls a recirculating air flap 41 and thereby keeps the negative pressure prevailing in the air flow in front of the roller mill 1 constant.

Über die Grießschnecke 27 wird zweckmäßig nur ein Teil der im Sichter 2 anfallenden Grieße entnom­men und direkt der Gutbettwalzenmühle 3 zugeführt. Die Regelung dieser Teilmenge geschieht über die Drehzahlverstellung der als Überlaufschnecke ar­beitenden Grießschnecke 27. Die entnommene Menge kann gewogen werden und so die Drehzahl der Schnek­ke regeln.Only a portion of the semolina accumulating in the classifier 2 is expediently removed via the semolina screw 27 and fed directly to the material bed roller mill 3. This partial quantity is regulated by adjusting the speed of the semolina screw 27, which works as an overflow screw. The quantity withdrawn can be weighed and thus regulate the speed of the screw.

Der pneumatische Transport des Mahlgutes in einer herkömmlichen Mahlanlage unter Verwendung einer Rollenmühle nimmt einen verhältnismäßig großen An­teil der gesamten, zur Vermahlung aufzuwendenden Energie in Anspruch. Durch die Erfindung wird nun das durch den Düsenring 11 nach unten fallende Mahlgut mittels der Gutbett-Walzenmühle 3 einer weiteren Zerkleinerung unterzogen und über das Becherwerk 4 dem Sichter 2 zugeführt. In diesem Mahlgut, das dem Sichter direkt aufgegeben wird, sind (je nach Art des zu vermahlenden Gutes) bis zu 50% Fertiggut enthalten. Dieser Materialan­teil wird somit dem pneumatischen Transport ent­zogen. Dadurch ergibt sich ein bis zu 40% nied­rigerer Druckverlust der Mahlanlage, was eine ent­sprechend hohe Energieeinsparung am Mühlenventila­tor zur Folge hat.The pneumatic transport of the ground material in a conventional grinding plant using a roller mill takes up a relatively large proportion of the total that is used for grinding Use energy. By means of the invention, the regrind falling down through the nozzle ring 11 is subjected to further comminution by means of the material bed roller mill 3 and fed to the classifier 2 via the bucket elevator 4. This regrind, which is fed directly to the classifier, contains (depending on the type of material to be ground) up to 50% finished product. This portion of the material is thus removed from the pneumatic transport. This results in an up to 40% lower pressure loss of the grinding system, which results in a correspondingly high energy saving on the mill fan.

Claims (8)

1. Method of crushing brittle material for grinding using a grinding zone with a rotating horizontal grinding track (7), in which
a) the material for grinding falling downwards over the edge of the grinding track is conveyed upwards mechanically and at least a proportion thereof is delivered to a sifting zone,
b) and at least a proportion of the tailings precipita­ted during sifting is returned to the grinding zone, characterised in that
c) before sifting, the material for grinding falling downwards over the edge of the grinding track (7) is first of all crushed in the gap between two rolls of a roll mill (3) which are pressed against one another with a high pressure.
2. Method as claimed in claim 1, characterised in that an adjustable proportion of the tailings precipitated during sifting is delivered together with the material for grinding falling downwards over the edge of the grinding track (7) direct to the roll mill (3) for crushing.
3. Method as claimed in claim 1, characterised in that the material for grinding which is crushed in the roll mill (3) is disagglomerated before sifting.
4. Method as claimed in claim 1, in which a regulable air stream is delivered from below to the rotating hori­zontal grinding track (7) through a nozzle ring (11) and pneumatically conveys the material crushed on the grind­ing track to the sifting zone, characterised in that the electric current consumption of the drive for the roll mill (3) is kept constant by altering the air speed in the nozzle ring (11).
5. Apparatus for crushing brittle material for grinding, containing
a) a roller mill (1) with a rotating horizontal grinding rack (7),
b) a sifter (2) arranged above the roller mill (1),
c) a bucket elevator (4) by means of which the material for grinding falling downwards over the edge of the grinding track (7) is conveyed upwards mechanically to the sifter (2),
d) an arrangement (39) for producing an air stream which pneumatically delivers material for grinding crushed on the grinding track (7) to the sifter (2) and after separation of the tailings delivers the fines to a separator (5), whilst at least a proportion of the tailings precipitated in the sifter is returned to the roller mill (1), characterised by
e) a roll mill (3) containing two rolls which are pressed against one another at a high pressure for crushing the material for grinding falling downwards over the edge of the grinding track (7).
6. Apparatus as claimed in claim 5, characterised in that the roll mill (3) is arranged between the roller mill (1) and the bucket elevator (4).
7. Apparatus as claimed in claim 5, characterised in that a conveyor device which is preferably constructed as a screw (27) which can be regulated in speed is connected to the hopper (24) of the sifter (2) which carries the tailings, and by means of this device an adjustable pro­portion of the tailings can be delivered direct to the roll mill (3).
8. Apparatus as claimed in claim 5, characterised in that the sifter (2) is constructed as a dynamic sifter with a rotating distributor plate (20) arranged above the sifting zone.
EP88107072A 1987-05-27 1988-05-03 Method and arrangement for breaking up grindable material Expired - Lifetime EP0292739B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873717976 DE3717976A1 (en) 1987-05-27 1987-05-27 METHOD AND SYSTEM FOR CRUSHING GROUND MATERIAL
DE3717976 1987-05-27

Publications (3)

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EP0292739A2 EP0292739A2 (en) 1988-11-30
EP0292739A3 EP0292739A3 (en) 1989-11-15
EP0292739B1 true EP0292739B1 (en) 1991-03-06

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EP88107072A Expired - Lifetime EP0292739B1 (en) 1987-05-27 1988-05-03 Method and arrangement for breaking up grindable material

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US (1) US4889289A (en)
EP (1) EP0292739B1 (en)
BR (1) BR8802553A (en)
CA (1) CA1301134C (en)
DE (2) DE3717976A1 (en)
DK (1) DK286288A (en)
ES (1) ES2021408B3 (en)
ZA (1) ZA883511B (en)

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CA1301134C (en) 1992-05-19
ZA883511B (en) 1988-11-22
BR8802553A (en) 1988-12-20
DE3861909D1 (en) 1991-04-11
DE3717976A1 (en) 1988-12-08
EP0292739A3 (en) 1989-11-15
EP0292739A2 (en) 1988-11-30
ES2021408B3 (en) 1991-11-01
US4889289A (en) 1989-12-26
DK286288D0 (en) 1988-05-25
DK286288A (en) 1988-11-28

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